Ranmaru is the best fencer in his school. One day, while he and his friend, Enjoji, are walking home from school, Yakuza from a rival syndicate tries to run over his friend with his car. Ranmaru pushed his friend out of the way and was hit instead of him. This event triggered the romance between Ranmaru and Enjoji. A few years later, the relationship between them is still going strong until Enjoji's half-brother Kai shows up and tries to take Ranmaru away from Enjoji. Then Masa, Kai's partner and mentor, shows up to see Kai.